drm/nouveau/device: detect if changing endianness failed (51c05340) · Commits · 戴 / test

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

+21 −5

Original line number	Diff line number	Diff line
		@@ -2924,6 +2924,20 @@ nvkm_device_del(struct nvkm_device **pdevice)
		}
		}

		static inline bool
		nvkm_device_endianness(void __iomem *pri)
		{
		u32 boot1 = ioread32_native(pri + 0x000004) & 0x01000001;
		#ifdef __BIG_ENDIAN
		if (!boot1)
		return false;
		#else
		if (boot1)
		return false;
		#endif
		return true;
		}

		int
		nvkm_device_ctor(const struct nvkm_device_func *func,
		const struct nvkm_device_quirk *quirk,
		@@ -2973,13 +2987,15 @@ nvkm_device_ctor(const struct nvkm_device_func *func,
		/* identify the chipset, and determine classes of subdev/engines */
		if (detect) {
		/* switch mmio to cpu's native endianness */
		#ifndef __BIG_ENDIAN
		if (ioread32_native(map + 0x000004) != 0x00000000) {
		#else
		if (ioread32_native(map + 0x000004) == 0x00000000) {
		#endif
		if (!nvkm_device_endianness(map)) {
		iowrite32_native(0x01000001, map + 0x000004);
		ioread32_native(map);
		if (!nvkm_device_endianness(map)) {
		nvdev_error(device,
		"GPU not supported on big-endian\n");
		ret = -ENOSYS;
		goto done;
		}
		}

		/* read boot0 and strapping information */